What Is an Incubation Period?
The incubation period is the number of days between when you’re infected with something and when you might see symptoms. Health care professionals and government officials use this number to decide how long people need to stay away from others during an outbreak. It’s different for every condition.
If you’ve been around someone who has the coronavirus that causes
Covi-19, you’re at risk, too. That means you need to stay home until you know you’re in the clear. Health professionals call this self-quarantine.
What Is the Incubation Period for the Omicron Variant?
Omicron is now the most dominant strain of coronavirus in the U.S., and its incubation period may be shorter than those of previous variants. Research is just beginning. But some scientists who've studied Omicron and doctors who've treated patients with it suggest the right number might be around 3 days.
Some early research suggests Omicron may be more contagious than the Delta variant. But health experts are still looking into how sick it can make people and how well vaccines and treatments work against it.
They expect vaccines and booster shots to help protect people from serious illness, hospitalization, and death. If you’re fully vaccinated you get a breakthrough infection of Omicron, you’re less likely to become seriously ill than an unvaccinated person.
What Is the Incubation Period for the Delta Variant?
The Delta variant, which evolved from previous strains of COVID-19, was once the most dominant type of coronavirus in the U.S. Research shows it spreads faster and has a shorter incubation period than the SARS-CoV-2 variants that came before it.
Delta’s incubation is around 4 days, compared to the 5.6 days for earlier strains. This means that if you get infected with the Delta strain, your symptoms may show up much faster. Your body will also shed the virus earlier.
The mutation allows the virus to produce a higher load of viral particles in the body. This makes the Delta variant more than 2 times as contagious as earlier variants. In fact, one study from China showed that in infections caused by Delta, the viral load was 1,000 times more than that of previous coronavirus strains.
When Is the Coronavirus the Most Contagious?
It's possible that, because of its shorter incubation period, you may become contagious more quickly if you have the Omicron variant. But we need more research on this.
If I Have COVID-19, How Long Am I Contagious?
According to the CDC, if you have mild to moderate COVID-19, you may be contagious for 10 days from the first day you noticed symptoms.
If you were severely affected or critically ill from COVID-19, you may stay infectious for up to 20 days from the start of your symptoms.
A large-scale review of 113 studies of COVID-19 from 17 countries found that if you have COVID-19, your infectiousness is highest 1 day before the start of your symptoms and begins to wane about a week later for most people. The review included several COVID-19 variants that emerged before Omicron, including Delta.
Studies have also found that the Omicron variant has a shorter incubation period, compared to other variants. For the Omicron variant, the incubation period is 2 to 4 days.
Can I Get or Spread COVID-19 During or After the Vaccination Process?
When you get a COVID-19 vaccine, it teaches your immune system to recognize the virus as a foreign element and fight it. Studies show that COVID-19 vaccines can greatly reduce your chances of getting infected with the virus. But if you do catch it after you’re vaccinated, the vaccine will still protect you from getting as seriously ill or needing hospitalization.
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